EP1530379A2 - Verfahren und Vorrichtung zur Farbkompensation in einer Bildanzeigevorrichtung für Benutzer mit Farbsehfehlern - Google Patents

Verfahren und Vorrichtung zur Farbkompensation in einer Bildanzeigevorrichtung für Benutzer mit Farbsehfehlern Download PDF

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Publication number
EP1530379A2
EP1530379A2 EP04026338A EP04026338A EP1530379A2 EP 1530379 A2 EP1530379 A2 EP 1530379A2 EP 04026338 A EP04026338 A EP 04026338A EP 04026338 A EP04026338 A EP 04026338A EP 1530379 A2 EP1530379 A2 EP 1530379A2
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EP
European Patent Office
Prior art keywords
color
user
perceptivity
colors
gain values
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04026338A
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English (en)
French (fr)
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EP1530379A3 (de
EP1530379B1 (de
Inventor
Hee Chul 102-1206 Hwajin Geumbong 1-cha APT. Kim
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LG Electronics Inc
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LG Electronics Inc
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals
    • H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/14—Solving problems related to the presentation of information to be displayed

Definitions

  • the present invention relates to an image display device, and more particularly, to a method of compensating colors in an image display device for users with color vision deficiency and a device of the same.
  • the present invention is suitable for a wide scope of applications, it is particularly suitable for allowing users with deficient color vision, namely, partial color blindness, to view displayed images as vividly and naturally as normal users.
  • 'color blind' people having color deficient vision as compared to normal people are referred to as 'color blind' or 'partially color blind'.
  • the broad definition of 'color blindness' is a deficiency in the overall color perceptive ability. More specifically, the term 'color blindness' is used when a person has completely lost the ability to perceive a specific color.
  • 'partial color blindness' refers to a state less severe than 'color blindness', wherein a person has, nevertheless, a deficient color perceptive ability as compared to someone with normal vision.
  • a 'partially color blind individual' eventually refers to someone with partial color blindness.
  • the term 'partially color blind individual/user' or 'individual/user with partial color blindness' will be used to describe users of the present invention who have partial color deficient vision, and not those who have completely lost the ability to distinguish certain colors.
  • the rod cells which contain information on the brightness of light
  • the cone cells which can distinguish colors and the brightness of light
  • Partial color blindness is mostly inherited, and it is known to have no medical cure.
  • the partially color blind individuals lack perceptivity for certain colors only and are fully capable of distinguishing the rest of the colors. And so, they generally judge that the colors they perceive through their eyes are natural and normal. Therefore, in certain cases, the partially color blind people are completely unaware of their color deficient vision, which leads them to the misconception that the colors seen through their eyes are in fact natural and normal to everybody else.
  • a method of compensating colors in an image display device includes a step of determining whether a user is partially color blind or normal, and a step of controlling gain values of a plurality of color signals depending upon the user's color perceptivity so as to compensate colors displayed on a screen, if the user is determined to be partially color blind.
  • the step of determining whether the user is partially color blind or normal is carried out by using a test pattern provided on the screen, or by using a user information pre-stored in the image display device, if the user is a pre-registered user.
  • a color of which a user's color perceptivity is not identical to that of a standard perceptivity value is detected, and gain values of color signals corresponding to colors other than the detected color are controlled.
  • the gain values of the plurality of color signals corresponding to the colors other than the detected color are proportionally controlled depending upon a contrast rate between the user's color perceptivity of the detected color and the standard perceptivity value.
  • a contrast gain corresponding to each of the color signals is controlled so as to control the gain values of the color signals.
  • a device of compensating colors in an image display device includes a memory for storing test patterns for testing a user's partial color blindness and a user information, and a controller determining the user's partial color blindness and a user's perceptivity of a plurality of colors, depending upon the test patterns or the user information, and controlling a gain values for a plurality of color signals depending upon the user's color perceptivity.
  • the controller determines the user's partial color blindness and the user's color perceptivity depending upon a plurality of answers to the test patterns provided by the user.
  • the controller may also determine the user's partial color blindness and the user's color perceptivity by searching the user's user information, if the user is a registered user.
  • the controller displays an icon or message for indicating that the colors of the screen are being compensated, as the controller controls the gain values of the plurality of color signals.
  • the image display device of the present invention will be referred to as a television (TV) receiver for simplicity.
  • TV television
  • most of the terminologies used in the description of the present invention are generally known terms. However, in some cases, terminologies specifically chosen by the inventor will also be used herein, the terminologies of which will be fully explained in the detailed description of the present invention. Therefore, the details of the present invention should not be understood based on such terminologies only, but by the meaning of the terms lying within the purpose of the present invention.
  • the term 'partially color blind individual/user' or 'individual/user with partial color blindness' will generally refer to individuals with vision (i.e. , a sense of color) different from that of normal individuals.
  • partial color blindness is categorized into a plurality of types, whereby color compensation for each type will be processed accordingly.
  • the different types of visions with partial color blindness will be described in detail with reference to FIGs. 1 to 4.
  • the three types of partial color blindness are specified as the first to third embodiments of the present invention. Nevertheless, it will be understood that when specifying the different types of partial color blindness in more detail, the spirit or scope of the present invention will also apply to any other type of partial color blindness apart from the three types described above.
  • FIGs. 1 to 4 illustrate graphs showing the difference in vision between a normal individual and a partially color blind individual in accordance with each of the three different types of partial color blindness.
  • the x-axis represents the wavelength (wherein the unit is in nanometers (nm))
  • the y-axis represents the responsivity (i.e. , degree of sensing a specific color) of the partially color blind individual.
  • the graphs represent the relation between three different types of wavelengths and the corresponding type of partial color blindness.
  • the three wavelengths are categorized based on their lengths, the shortest wavelength being s( ⁇ ), the medium wavelength being m( ⁇ ), and the longest wavelength being l( ⁇ ).
  • FIG. 1 illustrates a graph showing the vision of a normal individual, wherein the normal individual's responsivity to each of the s( ⁇ ), m( ⁇ ), and l( ⁇ ) wavelengths are equally 1.0.
  • FIG. 2 illustrates a graph showing the vision of an individual with Type 1 partial color blindness.
  • the individual with Type 1 partial color blindness shows a responsivity of 1.0 to the s( ⁇ ) and m( ⁇ ) wavelengths, which is the same as the normal individual. However, unlike the normal individual, the responsivity to the l( ⁇ ) wavelength is 0.75.
  • the medical terminology for this type of color blindness is Protanope, however, it will be referred to as the Type 1 partial color blindness for simplicity.
  • FIG. 3 illustrates a graph showing the vision of an individual with Type 2 partial color blindness.
  • the individual with Type 2 partial color blindness shows a responsivity of 1.0 to the s( ⁇ ) and I( ⁇ ) wavelengths, which is the same as the normal individual.
  • the responsivity to the m( ⁇ ) wavelength is 0.7.
  • the medical terminology for this type of color blindness is Deuteranope, however, it will be referred to as the Type 2 partial color blindness for simplicity.
  • FIG. 4 illustrates a graph showing the vision of an individual with Type 3 partial color blindness.
  • the individual with Type 3 partial color blindness shows a responsivity of 1.0 to the m( ⁇ ) and l( ⁇ ) wavelengths, which is the same as the normal individual.
  • the responsivity to the s( ⁇ ) wavelength is 0.5.
  • the medical terminology for this type of color blindness is Tritanope, however, it will be referred to as the Type 3 partial color blindness for simplicity.
  • each of the specific wavelengths respectively corresponds to each of the red (R), green (G), and blue (B) wavelengths, which are the basic colors used for representing and displaying an image.
  • the individual with the Type 1 partial color blindness shows deficient vision responsivity for the red (R) wavelength as compared to the normal individual.
  • the individual with the Type 2 partial color blindness shows deficient vision responsivity for the green (G) wavelength.
  • the individual with the Type 3 partial color blindness shows deficient vision responsivity for the blue (B) wavelength.
  • the colors red (R), green (G), and blue (B) will be referred to as R, G, and B, respectively, for simplicity.
  • the device and method of compensating colors so as to allow the users with the different types of partial color blindness to perceive the displayed colors as seen through the eyes of normal users, will now be described in detail.
  • FIG. 5 illustrates a block diagram of a device for compensating colors in the image display device according to the present invention.
  • a digital television (DTV) receiver is given-as an example for simplicity, nevertheless, the same description can also be equally applied to personal computers (PC) or mobile phones.
  • PC personal computers
  • a video signal received through a tuner 10 is decoded from a decoder 20.
  • the decoded video signal is then sent to an A/D converter 30 to be converted into a digital signal.
  • the A/D converter (ADC) 30 is not necessary.
  • the video signal outputted from the A/D converter 30 is inputted to a video processor 40, wherein the digitalized video signal is converted into R, G, and B signals.
  • the digitalized video signal is a luminance/color difference signal including Y, U, and V signals, which are then converted into R, G, and B signals at the video processor 40 in order to be suitable for human vision.
  • a microcomputer 70 generally controls the above-described process.
  • the microcomputer 70 also sends a command to a display controller 50 to compensate R, G, and B signals in accordance with the vision of the partially color blind user. Subsequently, the display controller 50 controls the gain values of the R, G, and B signals in the displayed image depending upon the color compensation command sent from the microcomputer 70.
  • a memory 80 allows the microcomputer 70 to determine whether the user is partially color blind or not by storing a user information of the corresponding user and a test pattern for testing partial color blindness. Therefore, the microcomputer 70 of the present invention determines the vision of the present user based on the data stored in the memory 80. The process will be described in detail with reference to FIGs. 6 and 7.
  • FIG. 6 illustrates a flowchart of a method of compensating colors in the image display device according to a first embodiment of the present invention. Referring to FIG. 6, the user's vision is verified through testing, and the flowchart of the color compensation process depending upon the verified result is illustrated herein.
  • the microcomputer 70 displays a series of test patterns for testing partial color blindness (e.g. , the test patterns shown in FIG. 8), which is pre-programmed in the memory 80 (S10).
  • a series of test patterns for testing partial color blindness e.g. , the test patterns shown in FIG. 8
  • the general patterns used for testing color blindness may be used.
  • the user views a series of test patterns displayed on the TV screen and uses the dial pad on the remote controller to input and transmit his or her answers.
  • the microcomputer 70 determines whether the user is partially color blind or not, based on the data provided by the user (S20). Also, when the user is determined to be partially color blind, then the type of partial color blindness is also determined accordingly.
  • test patterns for testing partial color blindness are shown in FIG. 8.
  • the general test patterns for testing color blindness are applied herein, whereby the test patterns enable the microcomputer 70 of the present invention to determine whether the user is 'partially color blind' or 'normal'. If designed and created in the future, a specialized test pattern for specifically testing partial color blindness may then be applied herein.
  • Step 20 when a user is determined to have a normal vision, the original gain values for the R, G, and B signals are used (S21). However, when the user is determined to have a color defective vision, then the gain values for the R, G, and B signals should be controlled.
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color red (R) color in a defective user with Type 1 partial color blindness is only 0.75 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the G and B signals to 0.75 times their original values (S31).
  • the gain values for the R, G, and B signals are compensated by controlling the contrast gain for each of the R, G, and B signals.
  • the contrast gain is used to represent the gain values for the R, G, and B signals: Rc, Gc, and Bc.
  • the controlled contrast gain is more than '1', in other words, when the number of signal bits inputted from the display controller 50 is greater than the number of signal bits outputted from the display controller 50, the maximum value for the control gains is normalized to '1'.
  • the contrast gains for the R, G, and B signals may vary within this range.
  • the above-described method for controlling the R, G, and B gain values are similarly applied to the remaining two types of partial color blindness.
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color green (G) color in a defective user with Type 2 partial color blindness is only 0.7 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the R and B signals to 0.7 times their original values (S41).
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color blue (B) color in a defective user with Type 3 partial color blindness is only 0.5 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the G and B signals to 0.5 times their original values (S50).
  • a display 60 when a color compensated image for partially color blind users is being displayed, a display 60 either notifies that color compensation is in process or displays an icon or message indicating the corresponding type of partial color blindness.
  • color compensation is carried out by controlling the gain values of remaining colors to be of the same level as to that of the specific color, thereby enabling the user with color deficient vision to view the displayed image as viewed by a normal user.
  • FIG. 7 illustrates a flowchart of a method of compensating colors in the image display device according to a second embodiment of the present invention.
  • a user is tested for partial color blindness, just as shown in FIG. 6, and a user information including the corresponding test results are pre-stored in the memory 80 of the device, then, after a simple user identification process, a color compensation suitable for the corresponding user is directly carried out.
  • a user identification process for verifying the current user is carried out (S70).
  • a plurality of conventional user identification methods can be used herein. Generally, a specific user can be verified by simply inputting data, such as user identification (ID) and password.
  • Another identification method can include selecting a corresponding user name or user number among a list of pre-registered users.
  • the microcomputer 70 searches for the corresponding user information of the verified user (S80). Thereafter, based on the user's color vision information included in the searched user information, the microcomputer 70 determines whether the user is normal or partially color blind, and if the user is partially color blind, then, the microcomputer 70 verifies the type of partial color blindness (S90).
  • Step 90 when the user is determined to be partially color blind, the microcomputer 70 carries out a color compensation process corresponding to the verified user (S91).
  • the same method of FIG. 6 may be used in the method for compensating colors depending upon the user's type of partial color blindness.
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color red (R) color in a defective user with Type 1 partial color blindness is only 0.75 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the G and B signals to 0.75 times their original values (S31).
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color green (G) color in a defective user with Type 2 partial color blindness is only 0.7 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the R and B signals to 0.7 times their original values (S41).
  • the gain values for the R, G, and B signals are controlled.
  • the perceptivity for the color blue (B) color in a defective user with Type 3 partial color blindness is only 0.5 times that of an individual with normal vision. Therefore, when compensating the colors, the microcomputer 70 lowers the gain values for the G and B signals to 0.5 times their original values (S50).
  • a display 60 when a color compensated image for partially color blind users is being displayed, a display 60 either notifies that color compensation is in process or displays an icon or message indicating the corresponding type of partial color blindness.
  • the method of compensating colors in an image display device for users with color vision deficiency and the device of the same according to the present invention are advantageous in that a wide range of users with deficient color vision can perceive displayed images as vividly and naturally as seen through the eyes of normal individuals.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Color Image Communication Systems (AREA)
  • Processing Of Color Television Signals (AREA)
  • Image Processing (AREA)
  • Digital Computer Display Output (AREA)
EP04026338A 2003-11-07 2004-11-05 Verfahren und Vorrichtung zur Farbkompensation in einer Bildanzeigevorrichtung für Benutzer mit Farbsehfehlern Expired - Lifetime EP1530379B1 (de)

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KR1020030078675A KR100587333B1 (ko) 2003-11-07 2003-11-07 색약자의 시각특성을 고려한 영상 디스플레이의색보정방법 및 장치
KR2003078675 2003-11-07

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EP1530379A2 true EP1530379A2 (de) 2005-05-11
EP1530379A3 EP1530379A3 (de) 2006-07-19
EP1530379B1 EP1530379B1 (de) 2009-08-12

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US (1) US7333117B2 (de)
EP (1) EP1530379B1 (de)
KR (1) KR100587333B1 (de)
CN (1) CN100581270C (de)
DE (1) DE602004022498D1 (de)

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US7333117B2 (en) 2008-02-19
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EP1530379B1 (de) 2009-08-12

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